On a peaceful and tranquil day, the lady of the house busily cleans from front to back, left to right, while Tom leisurely lies on the floor, fast asleep, completely ignoring her. Meanwhile, the little mouse Jerry swaggers as he carries cheese back to his hole, and Tom can't even be bothered to look. The owner seems utterly disappointed in him, showing no anger at all. Just then, the doorbell rings, and a delivery brings the item the lady has long awaited—the Mechano robot cat. It doesn't need feeding, never causes trouble, has no stray fur, and is clean and efficient. From now on, it will take over Tom's job of catching mice. The robot cat lives up to expectations, easily catches Jerry, and drives him out. A dejected Tom can only pack his bags and leave. 　　However, Jerry, who now faces a formidable enemy, will never allow this to happen. He must join forces with Tom...